Are the "Longyan Material Beads" you mentioned a gem or an ornament? Are there any pictures or more detailed information to describe this item? If you want to determine whether something is really a "Longyan light pearl", you'd better consult a professional jewelry appraiser or gemologist. They can determine the authenticity and quality of gems through testing and analysis. In addition, you can also check the source certificate or purchase certificate of the gem for more information.